jurek
Well-known member
Suppose a birder would try to clean up all REGULAR species of the ABA area as fast as possible, starting 1 January. How long could it take? Are there any regular ABA species not gettable until late autumn?
Or a variant - clean up all regular species of the ABA area in a shortest period of time (minimum number of continuous days of one calendar year). How long might it take?
Or a variant - clean up all regular species of the ABA area in a shortest period of time (minimum number of continuous days of one calendar year). How long might it take?